How is the size of an aldrop bolt designated?

The size is designated by the overall length of the sliding bolt (e.g., 200 mm, 250 mm).

What materials are permitted for manufacturing aldrop bolts under this standard?

Mild steel, brass, and aluminium alloy are the standard materials specified.

What finishes are recommended for mild steel aldrop bolts?

They should be stove-enamelled, copper-oxidized, or electroplated to prevent rusting, as per mutual agreement.

IS 206

: 1986

Door Bolts (Aldrop type)

CurrentSpecializedSpecificationBIMArchitectural · Doors, Windows and Shutters

Download PDF BIS Portal Google

This standard specifies the requirements for materials, dimensions, manufacture, and finish of aldrop type door bolts used in building construction. Architects and procurement engineers use this code to ensure standardized quality and proper functioning of door hardware fittings.

Specifies materials, dimensions, and finishes for Aldrop type door bolts.

Quick Reference Values

Standard nominal lengths200, 250, 300 mm

Minimum base plate thickness (Mild Steel)2.0 mm

Minimum base plate thickness (Brass/Aluminium)2.5 mm

Tolerance on sliding bolt length± 2.0 mm

Standard sliding bolt diameter16 mm (for lengths >= 250mm)

Practical Notes

Always specify the exact material (e.g., mild steel, brass, or aluminium) along with the standard reference, as IS 206 covers multiple base materials.

For doors in exterior or coastal applications, explicitly specify brass or heavily anodized aluminium aldrops to prevent premature corrosion.

Ensure the matching of hasps and sliding bolts is checked before installation so the locking mechanism operates smoothly without excessive play.